This is a sweet shaped like Ayu (sweetfish).
Ayu is a river fish.
Many sweet shops in Kyoto sell this Ayugashi in early summer.
They say it is based on the Kamo river’s Ayu.
(This one says Uji river’s Ayu.)
Inside of it is gyuhi (kneaded rice flour with sugar or starch syrup; kneaded for a long time into a translucent paste).
I really love it.